Pipe-wrench



T. NEWMAN. PIPE WRENCH (No Model.)

No. 450,972. Patented Apr. 21, 1891.

WITNESSES: bfigo MM BY y g fl ATTOHIVEYJ,

' 30 over which said jaw is placed.

UNITED STATES NATENT FFICE.

THOMAS NEIVMAN, OF POPLAR BLUFF, ASSIGNOR TO WILLIAM O. CAMPBELL,

' OF ST. LOUIS, MISSOURI.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 450,972, dated April21, 1891.

Application filed January 10, 1891- Serial No. 377,368. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS NEWMAN, of Poplar Bluff, Butler county,Missouri, have invented certain new and useful Improvements inPipe-Trenches, of which the following is afull, clear, and exactdescription, reference being had to the accompanying drawings, forming apart hereof.

My invention relates to improvements in :0 pipe-wrenches; and itconsists in the novel arrangement and combination of parts, as will bemore fully hereinafter described, and designated in the claim.

In the drawings, Figure 1 is a side elevation of my invention, showingthe same applied to an ordinary pipe. Fig. 2 is a top plan view of myinvention. Fig. 3 is a top plan View of a bifurcated hooked jaw which Iemploy in carrying out my invention, and Fig. 4 is a side elevationshowing my invention closed or not in a functional position.

Referring to the drawings, 1 indicates an arm or handle by which myinvention is manipulated and also functionally operated. To

the front end of said arm the bifurcated hooked jaw 2 is pivotallysecured by means of a nut-bolt 3. The angular portion of said jaw isprovided with a series of ratchet-teeth adapted to impinge and bitewhatever object Said jaw is bifurcated, as above stated, and interposedbetween the prongs or bifurcations thereof is a small lever 4, the endof which is curved and also provided with upwardly formed ratchet-teeth.Said lever 4 is pivotally secured between the prongs or bifurcations ofjaw 2 by means of a nut-bolt 5.

Pivotally secured by Ifieans of nut-bolt G to arm 1 and lever 4 are sideplates 7, between which said arm and said lever are interposed. Saidplates 7 are so secured to said arm 1 and lever 4 that they generallyoccupy a parallel position to the'main portion of hook 2. This parallelarrangement, in combination with the arm 1 and lover 4E, practicallyoperates in the manner of the parallelogram of forces, the principlesofwhich are well understood and need no elucidation.

Having given a fully explicit description of my invention, I will nowproceed to describe its application and its use. The parts are made andconstructed substantially as hereinbefore described. WVhen it is desiredto turn a pipe or any other object, the operator should lower or depressjaw 2, by which operation lever 4 is elevated, thereby affordingsufficient space between said jaw and said leverfor the reception of thedesired pipe. When arm 1 is elevated, the power applied to said arm istransmitted to plates 7, and from thence to lever 4:, and is ultimatelytransmitted in the form of pressure against the pipe or to whateverobject the wrench is applied. The greater the power applied to arm 1 thegreater will be the impinging contact between lever 4c and theresistance of the pipe or whatever is being turned.

Having fully described my invention, what I claim is A pipe-wrenchconsisting of an arm 1, a bifurcated jaw 2, pivotally secured to saidarm, a lever 4, pivotally secured to said jaw, and plates 7, pivotallysecured to said arm and lever for transmitting the power applied to thearm to the resistance to be overcome, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS NEVMAN.

\Vitnesses:

THos. M. LANE, SAMUEL GARDNER.

